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SM1231E433A

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Revision 1.0 11/2009 Page 7 of 8 www.semtech.com
© Semtech 2009
SM1231
USER GUIDE
4 BOM
An example BOM for the 915 MHz variant of the SM1231 is tabulated in Table 2.
REF VALUE TOL (±) SIZE COMMENT
U1 SX1231 - VQFN24 SX1231 Low-Power UHF Integrated Transceiver
R15 0R 1% 0402 External RESET pin
C1 10μF 20% 0603 Decoupling
C2 3.3pF 0.25pF 0402 PA_BOOST Matching (Comp. Value is Band Specific)
C3 N/F - 0402 PA_BOOST Matching (Comp. Value is Band Specific)
C4 6.8pF 0.5pF 0402 PA_BOOST Matching (Comp. Value is Band Specific)
C5 N/F - 0402 PA_BOOST Matching (Comp. Value is Band Specific)
C6 22pF 5% 0402 PA_BOOST Matching (Comp. Value is Band Specific)
C7 8.2pF 0.5pF 0402 PA_BOOST Matching (Comp. Value is Band Specific)
C8 10nF 10% 0402 Decoupling
C10 100nF 10% 0402 Decoupling
C11 100nF 10% 0402 Decoupling
C12 100nF 5% 0402 Decoupling
C13 15pF 5% 0402 Crystal Load Capacitor
C14 15pF 5% 0402 Crystal Load Capacitor
C15 100nF 10% 0402 Decoupling
C16 68pF 5% 0402 Decoupling
C17 4.7pF 0.25pF 0402 RFIO Matching (Comp. Value is Band Specific)
C18 8.2pF 5% 0402 RFIO Matching (Comp. Value is Band Specific)
C19 N/F - 0402 RFIO Matching (Comp. Value is Band Specific)
C20 6.8pF 0.5pF 0402 RFIO Matching (Comp. Value is Band Specific)
C21 N/F - 0402 RFIO Matching (Comp. Value is Band Specific)
C22 5.6pF 0.5pF 0402 RFIO Matching (Comp. Value is Band Specific)
L1 5.6nH 0.2nH 0402 PA_BOOST Matching (Comp. Value is Band Specific)
L2 5.6nH 0.2nH 0402 PA_BOOST Matching (Comp. Value is Band Specific)
L3 22nH 5% 0402 PA_BOOST Matching (Comp. Value is Band Specific)
L4 2.7nH 0.5nH 0402 PA_BOOST Matching (Comp. Value is Band Specific)
L5 3.9nH 0.2nH 0402 RFIO Matching (Comp. Value is Band Specific)
L6 33nH 5% 0402 RFIO Matching (Comp. Value is Band Specific)
L7 6.8nH 5% 0402 RFIO Matching (Comp. Value is Band Specific)
L8 6.8nH 5% 0402 RFIO Matching (Comp. Value is Band Specific)
Q1 32.000MHz - NX2520SA NDK Surface mount type crystal ±10ppm, CLoad=10pF
Table 2: SM1231 915 MHz BOM
5 References
• SX1231 Datasheet
• TN8000.18 Technical Note "XE8000 driving XE1200 transceivers Standard API definitions"
Revision 1.0 11/2009 Page 8 of 8 www.semtech.com
© Semtech 2009
SM1231
USER GUIDE
© Semtech 2009
All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright
owner. The information presented in this document does not form part of any quotation or contract, is believed to be
accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any
consequence of its use. Publication thereof does not convey nor imply any license under patent or other industrial or
intellectual property rights. Semtech assumes no responsibility or liability whatsoever for any failure or unexpected
operation resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or
electrical stress including, but not limited to, exposure to parameters beyond the specified maximum ratings or
operation outside the specified range.
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SM1231E433A

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